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It's easy to upgrade to Ubuntu 10.04 Lucid Lynx if have an Internet connection but what if you have no Internet access?

Well, if you don't have an Internet connection, you can still upgrade to Ubuntu 10.04 Lucid Lynx, but you'll need to download the Ubuntu 10.04 Lucid Lynx alternate CD somehow (ask a friend, go to an Internet Cafe, etc.). You can download the Ubuntu Alternate ISO from HERE.

Then, you can then either write the Ubuntu 10.04 Lucid Lynx Alternate ISO onto a CD or simply mount the ISO image using the following command:
sudo mount -o loop /path/to/ubuntu-10.04-alternate-i386.iso /media/cdrom

Where "/path/to/ubuntu-10.04-alternate-i386.iso" is the exact path to where you saved the ubuntu-10.04-alternate-i386.iso ISO.

Once you insert the CD or mount the ISO image, a dialog should pop up offering you the option to upgrade using that CD / ISO image.

If for some reason the upgrade dialog doesn't pop-up, press ALT + F2 and type:

-for Ubuntu:
gksu "sh /cdrom/cdromupgrade"

-For Kubuntu:
kdesudo "sh /cdrom/cdromupgrade"

[Thanks to paraisolinux]